|Publication number||US7171147 B2|
|Application number||US 10/965,642|
|Publication date||Jan 30, 2007|
|Filing date||Oct 14, 2004|
|Priority date||Nov 20, 2003|
|Also published as||US20050111889|
|Publication number||10965642, 965642, US 7171147 B2, US 7171147B2, US-B2-7171147, US7171147 B2, US7171147B2|
|Inventors||Steven O. Cormier, Dennis J. Grabb, Ralph E. Williams|
|Original Assignee||Eastman Kodak Company|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (22), Referenced by (2), Classifications (6), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application claims the benefit of Provisional application Ser. No. 60/523,790, filed Nov. 20, 2003. Reference is made to the following commonly assigned application, the disclosure of which is incorporated herein by reference:
U.S. patent application Ser. No. 10/965,412, filed on even filing date herewith, by Steven O. Cormier, et al., entitled, “FIXTURE FOR MOUNTING A SLEEVE MEMBER ON A MANDREL”;
The invention relates to electrostatography and to electrostatographic roller apparatus, and in particular to a double-sleeved roller including a novel mandrel with replaceable inner and outer sleeve members mounted concentrically thereon.
Usage of compliant rollers in electrophotographic apparatus is well known, which compliant rollers may incorporate a removable sleeve member mounted concentrically around a mandrel. Single-sleeved and double-sleeved compliant rollers have been disclosed, e.g., sleeved imaging rollers, sleeved intermediate transfer rollers, and sleeved rollers for use in a fusing station. Thus in an electrostatographic machine employing a sleeved roller, a toner image is typically formed on an imaging member, transferred in a first transfer operation from the imaging member to an intermediate transfer member, and subsequently transferred in a second transfer operation from the intermediate transfer member to a receiver member (e.g., paper), whereupon the toner image on the receiver is fixed thereon in a fusing station.
Compliant intermediate transfer rollers have for example been disclosed in the Rimai, et al. patent (U.S. Pat. No. 5,084,735), the Zaretsky and Gomes patent (U.S. Pat. No. 5,370,961), the Zaretsky patent (U.S. Pat. No. 5,187,526) and the Bucks, et al. patent (U.S. Pat. No. 5,701,567). In these exemplary patents a compliant intermediate transfer roller includes a central member to which is adhered a coating of a thick compliant layer having a relatively thin hard overcoat, which roller improves the quality of electrostatic toner transfer from an imaging member to a receiver as compared to a non-compliant intermediate roller.
The use of a removable endless belt or tubular type of blanket on an intermediate roller has long been practiced in the offset lithographic printing industry. As disclosed, for example, in the Julian patent (U.S. Pat. No. 4,144,812) an intermediate lithographic roller comprises a portion having a slightly smaller diameter than the main body of the roller, such that a blanket member may be slid along this narrower portion until it reaches a location where a set of holes located in the roller allow a fluid under pressure, e.g., pressurized air, to pass through the holes, thereby stretching the blanket member and allowing the entire blanket member to be slid onto the main body of the roller. After the blanket is located in a suitable position, the source of pressurized air or fluid under pressure is turned off, thereby allowing the blanket member to relax to a condition of smaller strain, such strain being sufficient to cause the blanket member to snugly embrace the roller. The Gelinas patent (U.S. Pat. No. 5,894,796) discloses that the tubular blanket may be made of materials including rubbers and plastics and may be reinforced by an inner layer of aluminum or other metal.
An intermediate transfer roller having a rigid core and a removable, replaceable intermediate transfer blanket has been disclosed in Landa, et al. (U.S. Pat. No. 5,335,054), and in Gazit, et al. (U.S. Pat. No. 5,745,829), whereby the intermediate transfer blanket is fixedly and replaceably secured and attached to the core. The intermediate transfer blanket includes a substantially rectangular sheet mechanically held to the core by grippers. The core (or drum) has recesses where the grippers are located. It is disadvantageous that the entire circumference of the intermediate transfer drum cannot be utilized for transfer because the blanket does not form a continuous covering of the core surface. Moreover, particulate contamination tends to collect in the unavoidable gap between the ends of the blanket.
An electrostatographic imaging member in the form of a removable replaceable endless imaging belt on a rigid roller is disclosed in Yu, et al. (U.S. Pat. No. 5,415,961). The electrostatographic imaging member is placed on the rigid roller and removed from the rigid roller by stretching the endless imaging belt with a pressurized fluid.
The Mammino, et al. patents (U.S. Pat. Nos. 5,298,956 and 5,409,557) disclose a reinforced seamless intermediate transfer member that may be in the shape of a belt, sleeve, tube or roll and including a reinforcing member in an endless configuration having filler material and electrical property regulating material on, around or embedded in the reinforcing member.
The May and Tombs patents (U.S. Pat. Nos. 5,715,505 and 5,828,931) disclose a primary image-forming roller including a thick compliant blanket layer adherently coated on a core member, the thick compliant blanket surrounded by a relatively thin photoconductive structure. The compliant primary imaging roller provides improved electrostatic transfer of a toner image directly to a receiver member. It is further disclosed that the compliant imaging roller can be used bifunctionally, i.e., it may serve as an intermediate member for electrostatic transfer of a toner image to a receiver. The May and Tombs patent (U.S. Pat. No. 5,732,311) discloses a compliant electrographic primary image-forming roller.
The Chowdry, et al. patent (U.S. Pat. No. 6,605,399) discloses a sleeved compliant primary image-forming roller and a method of making such a roller. The sleeve is a photoconductive member, the sleeve resting on a compliant layer coated on a core member. This has certain advantages over U.S. Pat. No. 5,715,505 and U.S. Pat. No. 5,828,931, in that the coatings on the roller are made more reliably and more cheaply, and also in that the photoconductive sleeve may be readily removed and replaced when at the end of its useful life, thereby lowering cost and reducing downtime. The Chowdry, et al. patent (U.S. Pat. No. 6,605,399) also includes an advantage over U.S. Pat. No. 5,415,961 by providing a core member coated by a thick compliant layer over which the sleeve member is placeable and removable. However, in certain embodiments of this Chowdry, et al. patent, the rigid core member is electrically biased to effect transfer of toner, and because the electrical properties of the compliant layer coated on the core member alter with age, the compliant layer has a finite lifetime requiring expensive periodic replacement of the coated core member. Moreover, the compliant layer is disadvantageously subject to damage when removing or replacing a sleeve member, and such damage may necessitate recoating or replacing the costly core member.
The Shifley, et al. patents (U.S. Pat. Nos. 6,259,873, 6,263,177 and U.S. Pat. No. 6,484,002) disclose apparatus including a roller (such as a photoconductive roller or an intermediate transfer roller) which roller has a removable replaceable surface or sleeve, and which roller is supported at one end in cantilevered fashion during sleeve removal or replacement via the other end of the roller. For operation of the roller, the roller is supported at both ends. A disconnectable supportive member is provided that can be disengaged and moved away from the roller so as to provide a free end for purpose of sleeve removal or replacement. This supportive member is moved back so as to engage and support the roller for operation.
The Cormier, et al. patent (U.S. Pat. No. 6,394,943) describes an image transfer drum inclusive of a mandrel having an air bearing to facilitate loading and removal of a resilient sleeve. The air bearing is provided with a pair of cooperating plates one of which is scored with equally spaced and radially extending grooves. When urged together, the plates define a central air chamber and a plurality of radially-extending passages serving to direct pressurized air radially from one end of the mandrel, at which end the sleeve can be removed and replaced. The pressurized air is conveyed to the central chamber via a pipe passing into the mandrel at the other end of the mandrel, at which other end the mandrel is supported in cantilever fashion during removal or replacement of a sleeve.
Advantage over the Chowdry, et al. patent (U.S. Pat. No. 6,605,399) and the Cormier, et al. patent (U.S. Pat. No. 6,394,943) is obtained by providing an electrostatographic double-sleeved roller, as disclosed in the Chowdry, et al. patent (U.S. Pat. No. 6,377,772). Such a type of double-sleeved roller (DSR) can be useful for a number of applications in an electrostatographic machine, for example as a primary image-forming member or as an intermediate transfer member. The DSR includes a cylindrical rigid core member, a replaceable removable multilayer inner sleeve member (ISM) in the shape of an endless tubular belt including at least one compliant layer (e.g., made of a polyurethane) such that the ISM surrounds and nonadhesively intimately contacts the core member, and a replaceable removable multilayer outer sleeve member (OSM) in the shape of an endless tubular belt including at least one synthetic layer such that the OSM surrounds and nonadhesively intimately contacts the ISM. The synthetic layer may include, for example, a plastic, a polymer, a copolymer, an elastomer, a foam, a photoconductive material, a material including filler particles, a material comprising two or more phases, or a material reinforced with fibers. Because of the double-sleeve construction, an accurately dimensioned core member can have a long life without need of replacement. Moreover, the core member can advantageously remain fixed to the electrostatographic apparatus in which it is mounted when a sleeve member is replaced, and in a preferred embodiment either or both OSM and ISM are removable from the same end of the roller. A DSR, as disclosed in the Chowdry, et al. patent (U.S. Pat. No. 6,377,772), has an extra advantage in that a stiffening layer can be included as an exterior outer surface of an ISM or more preferably as an exterior inner surface of an OSM, thereby avoiding certain coating complications, and facilitating mounting and demounting of the sleeves. Additionally, overall operating costs are reduced, inasmuch as either sleeve may be replaced without replacing the other, or else the inner and outer sleeves may be replaced with differing frequencies. Thus an inner or outer sleeve member can easily and independently be replaced on account of wear or damage, or replaced when at the end of a predetermined operational life. An expensive, finely toleranced core member can thereby be retained for long operational usage with many generations of sleeve members.
The Aslam, et al. patents (U.S. Pat. Nos. 6,393,249 and U.S. Pat. No. 6,567,641) disclose double-sleeved rollers for use in a fusing station of an electrostatographic machine, e.g., as fuser rollers, as pressure rollers, or both.
An inner sleeve member (ISM) employed according to the Chowdry, et al. patent (U.S. Pat. No. 6,377,772) includes a flexible high-modulus tubular band, e.g., as a strengthening band or backing layer concentric with and supporting an adhered compliant layer. With the outer sleeve member (OSM) removed, this backing layer facilitates handling of the ISM during its removal or replacement using a pressurized air technique akin to that disclosed in the Julian patent (U.S. Pat. No. 4,144,812). However, to manufacture such a reinforced ISM generally requires a costly coating process. Thus there is a need to reduce manufacturing expense. One solution is to utilize a relatively cheap, non-reinforced, compliant ISM, i.e., an ISM having no high-modulus band or backing layer, such as is disclosed below for inclusion in the present invention. However, a non-reinforced relatively stretchable ISM (not contemplated in the Chowdry, et al. patent (U.S. Pat. No. 6,377,772)) has a propensity to exhibit edge disturbance when the pressurized air technique is used to expand and axially slide the OSM over the ISM (prior to removing the ISM). There is, therefore, a companion need for a specialized mandrel to securely support a non-reinforced ISM during mounting and demounting of an OSM of a double-sleeved roller. Moreover, there is an ancillary need for such a mandrel to provide, at a lower cost than in the prior art, delivery of pressurized air for use with both the ISM and the OSM. To satisfy these needs, the present invention provides a novel double-sleeved roller which includes such a mandrel and such a non-reinforced ISM.
The present invention, for use in an electrostatographic machine, provides a double-sleeved roller (DSR) including: a novel cylindrically symmetrical mandrel, a replaceable removable inner sleeve member (ISM) in the shape of an endless compliant tubular belt surrounding (and non-adhesively intimately contacting) the mandrel, and a replaceable removable multilayer outer sleeve member (OSM) in the shape of an endless tubular belt including at least one synthetic layer with the OSM surrounding (and non-adhesively intimately contacting) the ISM. The novel mandrel is specifically and particularly adapted to support a non-reinforced ISM. This improved mandrel includes a number of relatively inexpensive members joined together so as to define channels for selectively conveying pressurized air to either of the OSM or the ISM for radial expansion thereof. Furthermore, a preferred embodiment of the improved mandrel includes a single source pipe for providing pressurized air so as to be able to selectively expand either of the two sleeve members.
During operation of the roller, each end of the roller is held in place by a support member. For removal and replacement of the OSM or the ISM, one end of the roller is disconnected from the respective support member and this disconnected support member is moved away while the other end of the roller continues to be supported in cantilever fashion.
The invention, and its objects and advantages, will become more apparent in the detailed description of the preferred embodiment presented below.
In the detailed description of the preferred embodiments of the invention presented below, reference is made to the accompanying drawings, in some of which the relative relationships of the various components are illustrated, it being understood that orientation of the apparatus may be modified. For clarity of understanding of the drawings, some elements have been removed, and relative proportions depicted or indicated of the various elements of which disclosed members are composed may not be representative of the actual proportions, and some of the dimensions may be selectively exaggerated.
The present invention provides a double-sleeved roller (DSR) for use in an electrostatographic machine, which DSR has certain advantages over that disclosed in the Chowdry, et al. patent (U.S. Pat. No. 6,377,772). The DSR of the invention includes a generally cylindrically symmetrical mandrel inclusive of a rigid sleeve-supporting member, a replaceable removable inner sleeve member (ISM) in the shape of an endless compliant tubular belt surrounding and nonadhesively intimately contacting the rigid sleeve-supporting member, and a replaceable removable multilayer outer sleeve member (OSM) in the shape of an endless tubular belt including at least one synthetic layer, with the OSM surrounding and nonadhesively intimately contacting the ISM. A disconnectable end of the mandrel incorporates three termination plates having specified axial profiles. During operation of the roller each end of the roller is held in place by a support member. For removal and replacement of the OSM or the ISM, the disconnectable end of the roller is disconnected from the respective support member and this disconnected support member is moved away while the other end of the roller continues to be supported in cantilever fashion.
The ISM has a primary but not necessarily exclusive function of providing compliance. The primary function of the OSM is dictated by the application for which the DSR is used, with the application determining the composition of the layer(s) included in the OSM. In a preferred application, with the OSM inclusive of a photoconductive layer structure, the DSR can be a compliant primary imaging member. Alternatively, the OSM can provide suitable layers for a double-sleeved compliant intermediate transfer member, for a compliant member for use in a fusing station, or for any other suitable type of compliant roller useful in an electrostatographic machine.
The mandrel disclosed in the Chowdry, et al. patent (U.S. Pat. No. 6,377,772), includes a plurality of radial pipes (in the form of bores) for conveying pressurized air from an interior chamber to the inner sleeve member. These pipes are expensive and difficult to fabricate. The mandrel of the invention advantageously provides members which when joined to one another mutually cooperate so as to form radial channels. Thus the mandrel of the invention includes at a disconnectable end a number of relatively inexpensive members having the form of termination plates joined together so as to define two sets of channels for selectively conveying pressurized air to the outer sleeve member (or to the inner sleeve member) for radial expansion thereof. Moreover, each of these termination plates has a specified axial profile. It is important that in a preferred embodiment of the invention the mandrel is specifically adapted to support a non-reinforced inner sleeve member. Furthermore, the mandrel of the present invention reduces complexity of construction by preferably including a single source-pipe for providing pressurized air for expansion of either of the two sleeve members, rather than two source-pipes (one for each sleeve member) as previously disclosed in the Chowdry, et al. patent (U.S. Pat. No. 6,377,772).
Compared with the prior art, a double-sleeved roller of the invention advantageously has reduced costs of manufacturing and of servicing, which lower costs derive primarily from the key features of: (1) the above-mentioned termination plates of the mandrel, (2) preferred use of a relatively cheap inner sleeve member, and (3) improved delivery of pressurized air for use in replacing either or both of the outer and inner sleeve members.
Turning now to
Sleeve-supporting member 120, labeled D, is rotatable about the roller axis and preferably has a predetermined outer diameter which is substantially constant along an operational length of the sleeve-supporting member, i.e., along a length wherein pressure contact is made by the roller when in operation use with another rotatable member included in the electrostatographic machine, e.g., another roller or a web. The sleeve-supporting member 120 preferably has a flat end surface 121 facing outward. Sleeve-supporting member 120, which is preferably generally hollow, may be constructed of any suitable material, preferably aluminum, and typically includes internal structural or reinforcing elements (not shown).
An inner termination plate (ITP) 115, labeled C, is operationally secured to end surface 121 of the sleeve-supporting member 120, the ITP preferably having a flat inward surface (not separately labeled) facing inward towards the preferably flat end surface 121 of the sleeve-supporting member. The inward surface of the ITP contacts the end surface 121 of the sleeve-supporting member 120 so as to form a first interface therebetween, the ITP further having a preferably flat outward surface 116.
A middle termination plate (MTP) 110, labeled B, is connected to the inner termination plate (ITP) 115, the MTP having a plurality of radially-extending grooves formed in a preferably planar inward surface thereof (not separately labeled). The inward surface of the MTP faces inward and contacts the outward surface 116 of the ITP so as to form a second interface therebetween, the radially-extending grooves extending from an annular recess (not shown in
An outer termination plate (OTP) 105, labeled A, is operationally connected to the middle termination plate (MTP) 110, and is reversibly removable therefrom. The OTP has a plurality of radially-extending grooves formed in a preferably planar inward surface thereof. The inward surface of the OTP (not separately labeled) contacts the outward surface 112 of the MTP so as to form a third interface therebetween, the grooves of the OTP extending radially from an annular recess of the OTP, the annular recess of the OTP formed in the inward surface of the OTP to a perimeter of the OTP, the third interface including the inward surface of the OTP and the radially-extending grooves of the OTP so as to cooperate to form a second annular chamber (not shown in
With further reference to
It is preferred that outer termination plate 105 have a central hole (central hole not shown in
As indicated in
Pressurized air can be introduced (see arrow b) via an entry port 137 leading into an interior volume 136 located inside axle member 135, and from thence into a pipe 138 and ultimately to the first and second annular chambers described above.
In one embodiment, pipe 138 passes into a hollow interior portion of sleeve-supporting member 120 and there divides into two pipes (not illustrated). One of these two pipes is selectively connectable with the first annular chamber formed between members A and B, and the other pipe is selectively connectable with the second annular chamber formed between members B and C. A switch mechanism (e.g., an electrically activated switch mechanism) directs the pressurized air into one or the other of the two pipes for purpose of removing and/or replacing a corresponding sleeve member.
In a preferred embodiment, such as is described below, a pipe such as pipe 138 leads directly through a hollow interior portion of sleeve-supporting member 120 to the second annular chamber (defined by members A and B) and from thence to the plurality of openings exemplified by opening 106 so as to provide the above-described plurality of radially directed air streams for removal and/or replacement of an outer sleeve member. In such a preferred embodiment, the first annular chamber (defined by members B and C) is prevented from connecting with pipe 138 by a removable mechanical obstruction or a plug (not illustrated in
In an alternative embodiment (not illustrated) a first entry port for pressurized air connects to a first pipe leading to a first annular chamber such as described in relation to
Outer sleeve member (OSM) 151 is preferably a reinforced tubular sleeve. Preferably, the OSM grips ISM 152 (where in mutual contact) with an interference of less than approximately 125 micrometers, and more preferably approximately 75±25 micrometers. Typically OSM 151 has a multilayer structure (not illustrated) which multilayer structure preferably includes a high modulus backing layer with one or more layers coated on the backing layer. For example, the high modulus backing layer can be made of nickel and the multilayer structure of OSM 151 can for example include a conventional composite photoconductor structure having a charge generation layer and an overlying charge transport layer.
As shown in
Inner sleeve member 152 overlaps and snugly grips a length, c′, on the sloping surface 160 of the tapered outer shape of member B, with ISM 152 having a terminating edge 162. The edge 162 is located such that a part of sloping surface 160 which is not covered by the overlapping portion of ISM 152 has a length, c, measured along surface 160. The length, c, is preferably in a range of approximately between 0.5–3 mm, and more preferably approximately 1 mm. The length, c′, which overlaps sloping surface 160 and is measured thereon as shown, preferably has magnitude such that (c+c′) is greater than about 9 mm.
The non-overlapped length, c, is a critical dimension. It may be seen that an enclosure labeled W is formed by the undersurface 154 of OSM 151, by the overlapping portion of ISM 152 having the length c′, by the uncovered length c, and by the inward surface 112 of member A. For reliable removal or replacement of the outer sleeve member 151, it is required that the uncovered length c, be sufficient so as to leave airflows unimpeded from the openings located at the ends of the plurality of radially-extending air passageways connecting the second annular chamber and the perimeter of the outer termination plate (such as opening 106 of
Similarly, an enclosure labeled V is formed by the undersurface 153 of ISM 152, the sloping surface 159, and by the inward surface of member B. On an occasion when ISM 152 is to be removed, the enclosure V provides a suitable volume for pressurized air to apply an expansion force to that portion of the undersurface 153 of ISM 152 overlying the sloping surface 159.
As shown in
The quantity U represents a certain thickness of the inner sleeve member 152, and the symbol Δ represents a dimension preferred to be in a range of approximately between 10 micrometers –30 micrometers.
Notwithstanding the above-described preference for a non-reinforced ISM in a double-sleeved roller using the above-described novel mandrel, an alternative embodiment provides an ISM (for use with a similar mandrel) which includes a high modulus backing layer, or a reinforcing layer. In this alternative embodiment, the backing layer is covered by a compliant layer, with the compliant layer entirely coating the backing layer and extending beyond at least one of the edges of the backing layer so as to provide at least one width of compliant material which contacts the mandrel where there is no backing layer. Such a width of unbacked compliant material can for example grip a cylindrically-shaped portion such as portion 157 of member B of
For mandrel assembly portion 200 of
The portion 157 of middle termination plate (MTP) 110 having a cylindrical outer shape has an axial length preferably in a range of approximately between 2 mm–6 mm (indicated by the arrows, h). The sloping adjoining portion of MTP 110 preferably has an outer shape 160 in the form of a conical taper having a taper angle, β, which taper angle is preferably in a range of approximately between 5°–45°, and more preferably between 10°–20°. A maximum axial thickness of MTP 110 as measured between preferably flat inner face 204 and preferably flat outer face 112 (indicated by the arrows, e) is preferably in a range of approximately between 12 mm–16 mm.
The portion 158 of outer termination plate (OTP) 105, having a cylindrical outer shape, has an axial length which is a critical dimension. In general, if this length is too short, pressurized air can disadvantageously leak out when attempting to remove an outer sleeve member. Conversely, if this length is too long, it is difficult to mount an outer sleeve member because of too great a sliding resistance. Thus, whatever the composition of the outer sleeve member for use in the present invention, it is necessary that the axial length of portion 158 have a suitable length so as to satisfy these criteria. In a preferred roller employing an outer sleeve member such as described above (i.e., having a backing layer) the axial length of portion 158 of outer termination plate (OTP) 105 is preferably in a range of approximately between 3.5 mm–6.0 mm (indicated by the arrows, g) and more preferably, approximately between 4.0 mm–5.0 mm. The sloping adjoining portion of OTP 105 preferably has an outer shape 161 in the form of a conical taper having a taper angle, α, which taper angle is preferably in a range of approximately between 1.5°–15°. More preferably, α is 5°±2°. A maximum axial thickness of OTP 105 as measured between preferably flat inner face 202 and preferably flat outer face 107 (indicated by the arrows, d) and is typically in a range of approximately between 12 mm–16 mm. As described above with reference to
Preferably, the concentricities of the members A, B, C, and D are accurately similar to one another. It is preferred that the individual concentricities differ from a certain mean concentricity by less than about 40 micrometers. Ideally, the outer shapes of the cylindrical portions of the members A, B, C, and D, viewed axially, have cylindricities which are preferably substantially equal to one another. Furthermore, members B, C, and D are mated to one another in a preferred manner such that the corresponding outer shapes are substantially similar, i.e., members B, C, and D have surfaces which are preferably mutually smooth within 5 micrometers longitudinally, i.e., in direction parallel to the roller axis. Such mutual smoothness and similarity of outer shapes is preferably achieved by connecting members B, C, and D in manner used operationally and then co-grinding these three members to a desired common outer diameter and smoothness.
With device 269 blocking tube 268 as shown, an admission of pressurized air into chamber 256 and from thence into annular volume 263 will expand outer sleeve member 251, thus permitting removal of OSM 251 from the roller portion 250 by sliding OSM 251 over the outer termination plate, A′. With further admission of pressurized air, a new outer sleeve member may be slidably installed in the reverse direction over the outer termination plate A′ and then over the existing inner sleeve member 252.
On the other hand, it may be required to remove and/or replace ISM 252 (with OSM 251 removed). This can be accomplished by the steps of: (1) removing outer termination plate A′; (2) opening pipe 268, e.g., by removing a plug 269; (3) making connection, on the outer side of member B′, between pipes 258 and 268; (4) admitting pressurized air into pipe 258 and from thence into pipe 268 and the radial channels such as channel 267 linking interior volume 266 and annular volume 264, thereby expanding inner sleeve member 252; and (5) slidably moving ISM 252 off the mandrel. To mount a new inner sleeve member on the mandrel, the above steps are carried out in reverse order. Alternatively, in lieu of step (3), a source of pressurized air can be directly connected to pipe 268 for purpose of expanding inner sleeve member 252.
For step (3) above, the pipes 258 and 268 can be connected using any suitable connecting device, e.g., a U-shaped tubular member or a hose (connecting mechanism not illustrated). For carrying out step (3) it has been found advantageous to attach, in lieu of member A′, a specially-shaped member to the outer face 261 of member B′. The specially-shaped member has a novel axial profile (specially-shaped member not illustrated). The specially-shaped member also provides for interior connection between pipes 258 and 268, such that the specially-shaped member and the member B′jointly and cooperatively form this interior connection. The specially-shaped member is disclosed in the Cormier, et al. co-pending patent application Ser. No. 10/965,412 filed with the U.S. patent and Trademark Office on even date herewith.
Turning now to
MTP 330 is formed having an annular recess such that with MTP 330 attached to ITP 320 as shown, the ITP 320 and the MTP 330 cooperate so as to form a first annular chamber 355 (see also
OTP 340 is formed having an annular recess such that with OTP 340 attached to MTP 330 as shown, the OTP 340 and the MTP 330 cooperate so as to form a second annular chamber 345. In addition, the OTP 340 and the MTP 330 cooperate so as to form a plurality of radially-extending air passageways connecting chamber 345 and the perimeter of OTP 340, the passageways terminating at endings such as endings 343 (see also
A pipe 311 is provided for transporting pressurized air into chamber 345 for removing or replacing the partially-mounted outer sleeve member 360 (indicated by the double ended arrow, x . . . x′). Pipe 311 is connectable to a source for the pressurized air, with pipe 311 housed in a hollow portion of member 310. Pipe 311 is connected to an assembly for supplying the pressurized air to chamber 345 via a pneumatic connector 358 and a nozzle 356, the assembly including a portion passing through a hole in the inner termination plate 320 and sealed, preferably using an o-ring 357, so as to prevent leakage of pressurized air from chamber 345 (also see
Roller portion 300 is provided with a shaft member 317 which is rotatable inside a roller bearing 315, the bearing member being secured on shaft member 317 by a nut 316. It is preferred for shaft member 317 to be made of a rigid material, preferably stainless steel. For demounting or mounting of the outer sleeve member 360 (in directions x, x′) the illustrated end of roller portion 300 is disconnected (as is shown in
Outer termination plate (OTP) 340 is provided with an axially centered round hole defined by circular wall 319, which round hole has a diameter larger than the outer diameter of the cylindrical surface 318. Thus with outer sleeve member 360 completely demounted (slid off the roller in the direction, x) and the bolts 341 removed, the (OTP) 340 is readily removable by translating it in the direction, x, and thereby passing it over the housing of the roller bearing 315. Removal of OTP 340, e.g., for purpose of replacing the inner sleeve member 350 as described herein above, also permits removal of the plug 336 for the same purpose. After a new inner sleeve member has been installed, plug 336 may be replaced (or a new plug installed in lieu of the original). During subsequent reassembly of OTP 340 on to the mandrel, a guide pin 342 is used to accurately guide repositioning of OTP 340 and to assist in reinstallation of the bolts 341.
In the preferred embodiment of
Outer termination plate 340′ has a thickness, T1, which thickness includes a cylindrical portion labeled X having an axial length, t1. The thickness T1 further includes a conical tapered portion 386 defined by a taper angle, θ.
Middle termination plate 330′ has a thickness, T2, which thickness includes a cylindrical portion labeled Y having an axial length, t2. The thickness T2 further includes a conical tapered portion 387 defined by a taper angle, ω.
Inner termination plate 320′ has a thickness, Y3, which thickness includes a cylindrical portion labeled Z having an axial length, t3. The thickness T3 further includes a conical tapered portion 388 defined by a taper angle, φ.
It is preferred that the outer diameter of the cylindrical portion X is greater than that of the cylindrical portions Y and Z by an amount equal to: twice the thickness of the inner sleeve member, plus 20 micrometers±10 micrometers.
In a particular embodiment, for use with a non-reinforced inner sleeve member having a thickness of 0.500 mm, it is preferred that:
diameter of cylindrical portion X=181.62 mm
diameter of cylindrical portion Y=180.60 mm
diameter of cylindrical portion Z=180.60 mm
θ=5 degrees±1 degree;
ω=15 degrees±5 degrees; and
φ=15 degrees±5 degrees.
In similar fashion, the inward facing side of the middle termination plate 330′, which is inclusive of the annular recess defined in
The invention has been described in detail with particular reference to certain preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4144812||Jun 2, 1977||Mar 20, 1979||Strachan & Henshaw Limited||Printing sleeves|
|US5084735||Oct 25, 1990||Jan 28, 1992||Eastman Kodak Company||Intermediate transfer method and roller|
|US5187526||Sep 23, 1991||Feb 16, 1993||Eastman Kodak Company||Method and apparatus of forming a toner image on a receiving sheet using an intermediate image member|
|US5298956||Oct 7, 1992||Mar 29, 1994||Xerox Corporation||Reinforced seamless intermediate transfer member|
|US5335054||Feb 11, 1993||Aug 2, 1994||Spectrum Sciences B.V.||Image transfer apparatus including intermediate transfer blanket|
|US5370961||Dec 2, 1992||Dec 6, 1994||Eastman Kodak Company||Method of electrostatic transferring very small dry toner particles using an intermediate|
|US5409557||Jan 3, 1994||Apr 25, 1995||Xerox Corporation||Method of manufacturing a reinforced seamless intermediate transfer member|
|US5415961||Sep 29, 1992||May 16, 1995||Xerox Corporation||Flexible belt supported on rigid drum for electrophotographic imaging|
|US5701567||May 30, 1996||Dec 23, 1997||Eastman Kodak Company||Compliant transfer member having multiple parallel electrodes and method of using|
|US5715505||May 30, 1996||Feb 3, 1998||Eastman Kodak Company||Image forming method and apparatus utilizing a compliant image member|
|US5732311||Dec 26, 1996||Mar 24, 1998||Eastman Kodak Company||Compliant electrographic recording member and method and apparatus for using same|
|US5745829||Jan 11, 1995||Apr 28, 1998||Indigo N.V.||Imaging apparatus and intermediate transfer blanket therefor|
|US5828931||May 30, 1996||Oct 27, 1998||Eastman Kodak Company||Compliant photoconductive image member and method of use|
|US5894796||Aug 1, 1997||Apr 20, 1999||Heidelberger Druckmaschinen Ag||Printing unit for a web-fed rotary printing press|
|US6259873||May 19, 2000||Jul 10, 2001||Nexpress Solutions Llc||Cantilever drum mount for document printer/copier|
|US6263177||May 19, 2000||Jul 17, 2001||Nexpress Solutions Llc||Document printer/copier with decoupleable drum-support member|
|US6377772 *||Oct 4, 2000||Apr 23, 2002||Nexpress Solutions Llc||Double-sleeved electrostatographic roller and method of using|
|US6393249||Oct 4, 2000||May 21, 2002||Nexpress Solutions Llc||Sleeved rollers for use in a fusing station employing an internally heated fuser roller|
|US6394943||May 19, 2000||May 28, 2002||Steven Cormier||Image transfer drum for document printer/copier|
|US6484002||Jun 8, 2001||Nov 19, 2002||Nexpress Solutions Llc||Document printer/copier with decoupleable drum-support member|
|US6567641||Oct 4, 2000||May 20, 2003||Nexpress Solutions Llc||Sleeved rollers for use in a fusing station employing an externally heated fuser roller|
|US6605399||Oct 22, 2002||Aug 12, 2003||Nexpress Solutions Llc||Sleeved Photoconductive member and method of making|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7892160 *||Aug 14, 2006||Feb 22, 2011||Eastman Kodak Company||Double sleeved electrophotographic member|
|US20080051275 *||Aug 14, 2006||Feb 28, 2008||Eastman Kodak Company||Double sleeved electrophotographic member|
|International Classification||G03G15/16, G03G15/00, G03G15/01|
|Sep 6, 2010||REMI||Maintenance fee reminder mailed|
|Jan 30, 2011||LAPS||Lapse for failure to pay maintenance fees|
|Mar 22, 2011||FP||Expired due to failure to pay maintenance fee|
Effective date: 20110130